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Description
Kyubey (キュゥべえ Kyūbē)
Kyubey is a genderless (though he apparently identifies as a male) extraterrestrial being posing as a familiar who can grant any wish to a certain girl, on the condition that she become a magical girl and fight against witches. When the chosen girl makes a contract with him, he extracts her soul and places it inside a soul gem, reconstructing their body into a shell that is more resilient in order to fight witches. He constantly tries to get Madoka to make a contract with him, as she allegedly possesses great magical potential within her that would allow her to become the most powerful magical girl. He can only be seen or heard by magical girls and those with "magical" potential, and is able to communicate with them telepathically.
Kyubey is later revealed to of a hive-minded race called the Incubators (インキュベーター Inkyubētā), who eat their dead and take their predecessor's place and identity. The Incubators developed the technology to convert emotions into energy, which they use to counter entropy and prevent the impending heat death of the universe. Having evaluated countless races throughout the universe, the Incubators find ideal subjects with humans, specifically pubescent and prepubescent girls as they produce the most energy which reaches its zenith when a magical girl's soul gem turns into a grief seed. Kyubey claims his race lacks emotions (or, at least, that those in his race who have emotions are abnormal), with little understanding of mortality or the value of life, considering their actions simply utilitarian in nature despite appearing cruel to others. Despite this, Kyubey is a very skilled manipulator as he leaves out the vital aspects of the contracts and only reveals the truth when asked. According to Kyubey, the very existence of the Magi-Witch system is what allowed the evolution of mankind's civilization, as many of the main events in human history have had magical girls involved. Despite answering all questions posed to him, there is still much about the universe that Kyubey has not spoken of.
In the side-story Puella Magi Kazumi Magica, Kyubey also appears as the contractor of all the magical girls in Asanaru City, including the Pleiades Saints. When the Pleiades learnt the truth about magical girls, they took one of Kyubey's corpses and used it to create their own Incubator Jubey, who could absorb darkness from soul gems. Furthermore, they had Umika cast a spell that would make Kyubey invisible to all other girls in the city and rewrite their own memories to believe they contracted with Jubey, in an attempt to stop more witches from being born. This ultimately backfires as Jubey turns out to be a failure.
In Rebellion, which takes place after the series, Kyubey sealed Homura outside the Law of Circles' jurisdiction to force Madoka back into the physical world in an attempt to restore the witch system of the previous timelines since his kind have been harvesting less energy in the new system. But the scheme backfired when Homura ended up stealing Ultimate Madoka's powers for herself, enslaving Incubators to take Madoka's place in taking on the curses of the new world. Kyubey is last seen lying on the ground, disheveled and shivering as he is driven mad by his sudden ability to feel emotions combined with being forced to shoulder the combined grief, suffering, and despair of every magical girl that is, was, or ever will be.

Nagisa Momoe (百江なぎさ Momoe Nagisa)
An 8 year old magical girl who first appears in Rebellion (The version that basically Altered the Universe into the Post Ultimate Wars Timeline.), technically appearing in the series as the Dessert Witch Charlotte (シャルロッテ Sharurotte) who violently killed Mami before being destoryed. Nagisa has a childish personality, but is shown to be more perceptive than the other magical girls. According to Charlotte's production notes from the anime, Nagisa became a magical girl after wishing to eat cheesecake with her terminally ill mother one last time, only to discover that she could have wished for her mother to be cured and immediately fall into despair, becoming a Witch.
In the ending of Rebellion, Nagisa is brought back to her original form as an agent of the Law of Cycles. She initially acts as the group's friendly mascot creature Bebe, living with Mami as she aids the group in defeating Nightmares by trapping them in a small cafe-esque Witch Barrier. She eventually reveals her true form and helps the girls fight Homullily's familiars and demonstrates her ability to access her old Witch powers even as a Magical Girl. She is last seen in Homura's new world with Mami, who saved her from a falling stack of cheese.

Description
Kyubey (キュゥべえ Kyūbē)
Kyubey is a genderless (though he apparently identifies as a male) extraterrestrial being posing as a familiar who can grant any wish to a certain girl, on the condition that she become a magical girl and fight against witches. When the chosen girl makes a contract with him, he extracts her soul and places it inside a soul gem, reconstructing their body into a shell that is more resilient in order to fight witches. He constantly tries to get Madoka to make a contract with him, as she allegedly possesses great magical potential within her that would allow her to become the most powerful magical girl. He can only be seen or heard by magical girls and those with "magical" potential, and is able to communicate with them telepathically.
Kyubey is later revealed to of a hive-minded race called the Incubators (インキュベーター Inkyubētā), who eat their dead and take their predecessor's place and identity. The Incubators developed the technology to convert emotions into energy, which they use to counter entropy and prevent the impending heat death of the universe. Having evaluated countless races throughout the universe, the Incubators find ideal subjects with humans, specifically pubescent and prepubescent girls as they produce the most energy which reaches its zenith when a magical girl's soul gem turns into a grief seed. Kyubey claims his race lacks emotions (or, at least, that those in his race who have emotions are abnormal), with little understanding of mortality or the value of life, considering their actions simply utilitarian in nature despite appearing cruel to others. Despite this, Kyubey is a very skilled manipulator as he leaves out the vital aspects of the contracts and only reveals the truth when asked. According to Kyubey, the very existence of the Magi-Witch system is what allowed the evolution of mankind's civilization, as many of the main events in human history have had magical girls involved. Despite answering all questions posed to him, there is still much about the universe that Kyubey has not spoken of.
In the side-story Puella Magi Kazumi Magica, Kyubey also appears as the contractor of all the magical girls in Asanaru City, including the Pleiades Saints. When the Pleiades learnt the truth about magical girls, they took one of Kyubey's corpses and used it to create their own Incubator Jubey, who could absorb darkness from soul gems. Furthermore, they had Umika cast a spell that would make Kyubey invisible to all other girls in the city and rewrite their own memories to believe they contracted with Jubey, in an attempt to stop more witches from being born. This ultimately backfires as Jubey turns out to be a failure.
In Rebellion, which takes place after the series, Kyubey sealed Homura outside the Law of Circles' jurisdiction to force Madoka back into the physical world in an attempt to restore the witch system of the previous timelines since his kind have been harvesting less energy in the new system. But the scheme backfired when Homura ended up stealing Ultimate Madoka's powers for herself, enslaving Incubators to take Madoka's place in taking on the curses of the new world. Kyubey is last seen lying on the ground, disheveled and shivering as he is driven mad by his sudden ability to feel emotions combined with being forced to shoulder the combined grief, suffering, and despair of every magical girl that is, was, or ever will be.

Nagisa Momoe (百江なぎさ Momoe Nagisa)
An 8 year old magical girl who first appears in Rebellion (The version that basically Altered the Universe into the Post Ultimate Wars Timeline.), technically appearing in the series as the Dessert Witch Charlotte (シャルロッテ Sharurotte) who violently killed Mami before being destoryed. Nagisa has a childish personality, but is shown to be more perceptive than the other magical girls. According to Charlotte's production notes from the anime, Nagisa became a magical girl after wishing to eat cheesecake with her terminally ill mother one last time, only to discover that she could have wished for her mother to be cured and immediately fall into despair, becoming a Witch.
In the ending of Rebellion, Nagisa is brought back to her original form as an agent of the Law of Cycles. She initially acts as the group's friendly mascot creature Bebe, living with Mami as she aids the group in defeating Nightmares by trapping them in a small cafe-esque Witch Barrier. She eventually reveals her true form and helps the girls fight Homullily's familiars and demonstrates her ability to access her old Witch powers even as a Magical Girl. She is last seen in Homura's new world with Mami, who saved her from a falling stack of cheese.